Strict Standards problem

[AyoPrez]

I get this error in the top of my page

Warning: Declaration of The_Bootstrap_Nav_Walker::start_lvl(&$output, $depth) should be compatible with Walker_Nav_Menu::start_lvl(&$output, $depth = 0, $args = Array) in...

Warning: Declaration of The_Bootstrap_Nav_Walker::start_el(&$output, $item, $depth, $args) should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in...

[drewkinney]

Which page? Dashboard? Home? Page? Post? Post feed?

[AyoPrez]

Page. I used many different pages to build my webpage, and that was shown in all the pages. And when I tried to go into the dashboard, I couldn't, because there was more errors